Store the device type (obtained from i2c_device_id) as an enum and add a
default type of unknown to distinguish from case when this is not set
at all.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>